diff --git a/api/bulk_operation.php b/api/bulk_operation.php
index 57fa6ec..bc3a14f 100644
--- a/api/bulk_operation.php
+++ b/api/bulk_operation.php
@@ -131,12 +131,19 @@ if (isset($result['error'])) {
     if ($inaccessibleCount > 0) {
         $message .= " ($inaccessibleCount skipped - no access)";
     }
-    echo json_encode([
+    $response = [
         'success' => true,
         'operation_id' => $operationId,
         'processed' => $result['processed'],
         'failed' => $result['failed'],
         'skipped' => $inaccessibleCount,
         'message' => $message
-    ]);
+    ];
+    // Best-effort batches (the default; see processBulkOperation()'s docblock)
+    // can partially fail — surface the per-ticket reasons so the admin isn't
+    // just told a count. The dashboard's bulkResultMessage() already expects this.
+    if (!empty($result['errors'])) {
+        $response['errors'] = $result['errors'];
+    }
+    echo json_encode($response);
 }
diff --git a/assets/js/dashboard.js b/assets/js/dashboard.js
index fca33fd..f0369dc 100644
--- a/assets/js/dashboard.js
+++ b/assets/js/dashboard.js
@@ -140,25 +140,25 @@ document.addEventListener('DOMContentLoaded', function() {
                 break;
             // Bulk operation perform actions
             case 'perform-bulk-assign':
-                performBulkAssign();
+                performBulkAssign(target);
                 break;
             case 'close-bulk-assign-modal':
                 closeBulkAssignModal();
                 break;
             case 'perform-bulk-priority':
-                performBulkPriority();
+                performBulkPriority(target);
                 break;
             case 'close-bulk-priority-modal':
                 closeBulkPriorityModal();
                 break;
             case 'perform-bulk-status':
-                performBulkStatusChange();
+                performBulkStatusChange(target);
                 break;
             case 'close-bulk-status-modal':
                 closeBulkStatusModal();
                 break;
             case 'perform-bulk-close':
-                performBulkCloseAction();
+                performBulkCloseAction(undefined, target);
                 break;
             case 'close-bulk-close-modal':
                 closeBulkCloseModal();
@@ -491,7 +491,10 @@ function closeBulkCloseModal() {
     if (modal) setTimeout(() => modal.remove(), 300);
 }
 
-function performBulkCloseAction(ticketIds) {
+function performBulkCloseAction(ticketIds, btn) {
+    if (btn && btn.disabled) return; // already in flight — guards against a double-click firing two requests
+    if (btn) btn.disabled = true;
+
     ticketIds = ticketIds || getSelectedTicketIds();
     const commentEl = document.getElementById('bulkCloseComment');
     const comment = commentEl ? commentEl.value.trim() : '';
@@ -524,7 +527,8 @@ function performBulkCloseAction(ticketIds) {
         }
         closeBulkCloseModal();
         lt.toast.error('Bulk close failed: ' + error.message, 5000);
-    });
+    })
+    .finally(() => { if (btn) btn.disabled = false; });
 }
 
 var _bulkAssignUserId = null;
@@ -596,7 +600,8 @@ function closeBulkAssignModal() {
     if (modal) setTimeout(() => modal.remove(), 300);
 }
 
-function performBulkAssign() {
+function performBulkAssign(btn) {
+    if (btn && btn.disabled) return; // already in flight — guards against a double-click firing two requests
     const userId = _bulkAssignUserId;
     const ticketIds = getSelectedTicketIds();
 
@@ -605,6 +610,8 @@ function performBulkAssign() {
         return;
     }
 
+    if (btn) btn.disabled = true;
+
     lt.api.post('/api/bulk_operation.php', {
         operation_type: 'bulk_assign',
         ticket_ids: ticketIds,
@@ -625,7 +632,8 @@ function performBulkAssign() {
     })
     .catch(error => {
         lt.toast.error('Bulk assign failed: ' + error.message, 5000);
-    });
+    })
+    .finally(() => { if (btn) btn.disabled = false; });
 }
 
 function showBulkPriorityModal() {
@@ -672,7 +680,8 @@ function closeBulkPriorityModal() {
     if (modal) setTimeout(() => modal.remove(), 300);
 }
 
-function performBulkPriority() {
+function performBulkPriority(btn) {
+    if (btn && btn.disabled) return; // already in flight — guards against a double-click firing two requests
     const priorityEl = document.getElementById('bulkPriority');
     if (!priorityEl) return;
     const priority = priorityEl.value;
@@ -683,6 +692,8 @@ function performBulkPriority() {
         return;
     }
 
+    if (btn) btn.disabled = true;
+
     lt.api.post('/api/bulk_operation.php', {
         operation_type: 'bulk_priority',
         ticket_ids: ticketIds,
@@ -703,7 +714,8 @@ function performBulkPriority() {
     })
     .catch(error => {
         lt.toast.error('Bulk priority update failed: ' + error.message, 5000);
-    });
+    })
+    .finally(() => { if (btn) btn.disabled = false; });
 }
 
 // Make table rows clickable
@@ -786,7 +798,8 @@ function closeBulkStatusModal() {
     if (modal) setTimeout(() => modal.remove(), 300);
 }
 
-function performBulkStatusChange() {
+function performBulkStatusChange(btn) {
+    if (btn && btn.disabled) return; // already in flight — guards against a double-click firing two requests
     const bulkStatusEl = document.getElementById('bulkStatus');
     if (!bulkStatusEl) return;
     const status = bulkStatusEl.value;
@@ -800,6 +813,8 @@ function performBulkStatusChange() {
     const commentEl = document.getElementById('bulkStatusComment');
     const comment = commentEl ? commentEl.value.trim() : '';
 
+    if (btn) btn.disabled = true;
+
     lt.api.post('/api/bulk_operation.php', {
         operation_type: 'bulk_status',
         ticket_ids: ticketIds,
@@ -829,7 +844,8 @@ function performBulkStatusChange() {
         }
         closeBulkStatusModal();
         lt.toast.error('Bulk status change failed: ' + error.message, 5000);
-    });
+    })
+    .finally(() => { if (btn) btn.disabled = false; });
 }
 
 /**
diff --git a/models/BulkOperationsModel.php b/models/BulkOperationsModel.php
index 47dee2c..afd64be 100644
--- a/models/BulkOperationsModel.php
+++ b/models/BulkOperationsModel.php
@@ -106,12 +106,18 @@ class BulkOperationsModel
     /**
      * Process a bulk operation
      *
-     * Uses database transaction to ensure atomicity - either all tickets
-     * are updated or none are (on failure, changes are rolled back).
+     * Runs the whole batch inside one database transaction, but by default
+     * ($atomic = false, which is what api/bulk_operation.php uses) that
+     * transaction is always committed: a per-ticket failure (e.g. a
+     * disallowed workflow transition) is recorded in $failed/$errors and
+     * skipped, while every other ticket in the batch still succeeds. This
+     * is a best-effort batch, not an all-or-nothing one — set $atomic to
+     * true to roll back the entire batch when any ticket fails.
      *
      * @param int $operationId Operation ID
      * @param bool $atomic If true, rollback all changes on any failure
-     * @return array Result with processed and failed counts
+     * @return array Result with processed/failed counts and an errors[] list of
+     *               per-ticket failure reasons (surfaced to the admin by the caller)
      */
     public function processBulkOperation($operationId, bool $atomic = false)
     {